Immediately following the catheter ablation, patients will undergo a renal angiogram in order to assess suitability for catheter-based renal sympathetic denervation. A renal angiogram is an x-ray study of the blood vessels in the kidney to evaluate for blockage, and abnormalities that could be affecting the blood supply to the kidney. It is performed by injecting contrast dye through a catheter (a tiny tube) into the blood vessels of the kidney. The study doctor will assess whether the renal arteries are suitable to receive catheter-based renal denervation. Once you agree to participate in this study, by signing this informed consent, and are it is determined that you are eligible to participate you will be randomized to one of two treatment groups immediately following the renal angiogram.